Class: MotionWiretap::WiretapKvo

Inherits:
WiretapTarget show all
Defined in:
lib/motion-wiretap/all/wiretap.rb

Direct Known Subclasses

WiretapView

Instance Attribute Summary collapse

Attributes inherited from WiretapTarget

#target

Instance Method Summary collapse

Methods inherited from Wiretap

#and_then, #cancel!, #combine, #dealloc, #enqueue, #filter, #listen, #map, #on_error, #queue, #reduce, #trigger_changed_on, #trigger_completed, #trigger_completed_on, #trigger_error, #trigger_error_on

Constructor Details

#initialize(target, property, &block) ⇒ WiretapKvo

Returns a new instance of WiretapKvo.



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# File 'lib/motion-wiretap/all/wiretap.rb', line 206

def initialize(target, property, &block)
  @property = property
  @value = nil
  @initial_is_set = false
  @bound_to = []
  super(target, &block)

  @target.addObserver(self,
    forKeyPath: property.to_s,
    options: NSKeyValueObservingOptionNew | NSKeyValueObservingOptionInitial,
    context: nil
    )
end

Instance Attribute Details

#property ⇒ Object (readonly)

Returns the value of attribute property.



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# File 'lib/motion-wiretap/all/wiretap.rb', line 203

def property
  @property
end

#value ⇒ Object (readonly)

Returns the value of attribute value.



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# File 'lib/motion-wiretap/all/wiretap.rb', line 204

def value
  @value
end

Instance Method Details

#bind_to(wiretap) ⇒ Object 



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# File 'lib/motion-wiretap/all/wiretap.rb', line 232

def bind_to(wiretap)
  @bound_to << wiretap
  wiretap.listen do |value|
    @target.send("#{@property}=".to_sym, value)
  end
  wiretap.trigger_changed

  return self
end

#observeValueForKeyPath(path, ofObject: target, change: change, context: context) ⇒ Object 



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# File 'lib/motion-wiretap/all/wiretap.rb', line 242

def observeValueForKeyPath(path, ofObject: target, change: change, context: context)
  @value = change[NSKeyValueChangeNewKey]
  if @initial_is_set
    trigger_changed(@value)
  else
    @initial_is_set = true
  end
end

#teardown ⇒ Object 



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# File 'lib/motion-wiretap/all/wiretap.rb', line 220

def teardown
  @target.removeObserver(self,
    forKeyPath: @property.to_s
    )
  @bound_to.each &:cancel!
  super
end

#trigger_changed(*values) ⇒ Object 



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# File 'lib/motion-wiretap/all/wiretap.rb', line 228

def trigger_changed(*values)
  super(@value)
end